I am fine with the current policy as is, at least for now as a trial. I do think that
@AnxietyRanger has a point, and I am beginning to better understand his approach.
He is not asking for no idle fees, he is simply trying to address the unknown due to variability in rate of charge, during a charge, right? I think, to sum it up in one phrase, what you are asking for is this:
Charge an idle fee starting at the estimated time of charge completion, or when charge has been completed, whichever is latter.
So,
@AnxietyRanger, let me see if I can put into play what you are proposing:
1. You arrive to a Supercharger with X miles remaining your battery. You have your charge limit set to 80%.
2. You plug in, and the dash says: “You have 50 minutes until charge completed. You will be charged an idle fee of $0.40 per minute at this time”.
3. You look at your watch, and happily skip away to enjoy your meal with a big grin on your face knowing that you are driving the coolest car in the world.
4. While you are gently slicing through your filet mignon, or slowly sipping your pumpkin slice latte, or savoring your Happy Meal, unbeknownst to you, one of two things happens:
a. The charge rate on your car sudden speeds up because the gentlemen you paired with finished (there were no unpaired stalls available when you arrived). Now, following the rule above, instead of 50 minutes to completion, it is only 35 minutes to completion. You receive a text notification that your charge is almost complete. Idle fees will begin in 15 minutes (50- 35)
You still get charged idle fees based on the initial 50 minutes estimate, not on the new 35 minutes. Though, because you are a considerate person, you move your car early anyway, or
b. The charge rate on your car suddenly drops because the charge handle got too hot. It is now going to take 65 minutes to complete your charge.
You get charged an idle fee when the car completes charging at 65 minutes, not 50.
5. There is no grace period.
This sounds pretty good. My only concern is how the estimated time to completion is calculated. I have received an estimate right after plugging in, but a more accurate estimate about 60 seconds later. This does not help with the average and majority user such as with @sorka‘s wife above. Perhaps no estimate should be given until the car gets a good sense, and since most drivers just plug in and walk away, as soon as the estimate is known, a (reliable) alert is sent to their phone.